Pop safety-valve.



PATENTBD AUG. 18, 1903.

J. GOLLIS.

POP SAFETY VALVE.

APPLIouIoN FILED oc'1.11, 1902.

F0 IODEL ivo. 736,826.

UNITED STATESY I Patented lugu'st 10,190.

`PATI-rrr OFFICE.

-JOHN OOLLIS, OF DES MOINES, IOWA, ASSIGNOR TO WILLIAM P. OOLLIS, OF

NEW YORK, N. Y.

PP SAFETY-VALVE.

SPECIFICATION forming part of Letters Platent N o. 736,820, dated August18, 1903. i pplication iiled October 11,1902. Serial No. 126,951. (Nomodel.) i

.To a/ZZ whom it may concern:

Be it known that I, JOHN CoLLIs, a citizen of the United States,residing at Des Moines,

y in partially counterbalancing the pressure of the steam upon thesafety-valve, the remainder of the pressure being counterbalanced bymeans of a spring, to the end that a comparatively small and inexpensivespring may be used on pop safety-valves of this class designed to openonly upon the yapplication of a comparatively great steam-pressure onthe safetyvalve. I-leretofore in valves of this class it has `beencustomary to counterbalance the internal boiler-pressure upon the valvewholly by means of a spring, thus necessitating the employment of a veryheavy and expensive spring on boilers operated at a very highsteam-pressure-such, for instance, as marine boilers.

A further object is to'provide a valve of this class which may betemporarily locked in its closed position, so that any of the operativeparts of the valve-controllin g mechanism may be removed for repair orreplacement without danger of opening the valve or without cutting o thesteam-pressure upon the valve.

A further object is to provide a valve of this class in which thetension of the spring may be readily, quickly, and easily adjusted, sothat the valve may open on `any predetermined amount of steam-pressureas applied on the interior of the boiler.

My invention consists in certain details in the construction,arrangement, and combination of the variouspartsof the device wherebythe objects above contemplated are attained, as hereinafter more fullyset forth, pointed out in my claims, and illustrated in theacaccompanying drawings, in which- Figure 1 shows a side elevation of apop safety-valve with my improvements applied thereto, one side of thepiston supporting loop being broken away. Fig. 2 shows a vorticalcentral sectional View through the safety-valve proper. Fig@ 3 shows avertical central sectional view through the counterbalancing-cylinder.central sectional view through the counterbalancing-spring. Fig. 5 showsa side eleval`tion of the device for locking the safety-valve in itsclosed position, and Fig. 6 shows a plan view of one of the guide-platesof the counterbalancing-spring.

Referring to the accompanying drawings, 1 have used thereference-numeral 10 to indicate a valve-casing of the kind usuallyemployed in pop safety-valves. Said casing is `provided with a number ofopenings 11 near the upper end, through which the steam may pass whenthe valve is open.

The numeral 12 indicates the valve proper, seated within the casing andmounted on the valve-seat and so arranged that when the valve is in itsclosed position the passageway through the casing is closed and when thevalve'is in its elevated position the passage-way is open. At the top ofthe valvecasing is an arm 14, to which `a lever 15 is fulcrumed. Thislever passes through a slot in the top of valve-stem 13, and a roller 16is provided in the valve-stem in the lower end of the slot, which rolleris normally in` engagement with the lower edge of the lever 15. On theopposite end of arm 14 is a slotted guide-army?, through which the lever15 also passes and which limits the upward movement of said lever.Formed on or iixed to the lower part of the valve-casing is alaterally-projecting arm 18, substantially parallel with lever 15.Obviously as the valve 12 is elevated the free end of the said lever 15will also be raised.

I have provided means whereby the steampressure on the interior of theboiler to which the valve-casing 10 is attached may be utilized inpartially counterbalancing the upward pressure upon the valve 12 asfollows: The numeral 19 indicates a hanger connected with lever 15 bymeans of the bolt 2O and Fig.4 shows a vertical provided with avertically-elongated opening IOO a vertically-arranged cylindricalchamber 24, to the top of which a screw-cap is attached, and ascrew-plug 26, having a central opening, is placed in the bottom of saidcylindrical opening. Beneath the cap 26 the said yoke 22 is providedwith an opening 27, through which opening the lower end of hanger 19 ispassed, as clearly shown in Fig.

3, so that the hanger 19 may move vertically to alimited degree throughthe said opening 27.

The numeral 28 indicates a piston-rod eX- tending vertically through thelower end of yoke 19 and adjustably held therein by the nuts 29 on thepiston-rod above and below the yoke. The upper end of piston-rod 28passes through the opening in the screw-plug 26, and a piston 30,`preferably of cup shape, is attached to the upper end of the pistonrod28 in the cylindrical chamber 24.

The numeral 31 indicates a steam-pipe leading from the valve-chamber 10at a point below the valve 12 to the upper end portion of thecylindrical chamber 24, and a cut-oft valve 32 is provided in this pipe.

From the foregoing description it is obvious that when the valve 32 isopened the entire boiler-pressure of the steam will be applied in thecylinder to hold the piston 30 to its downward limit of movement, thustending to hold valve 12 to its seat.

In use we so proportion the diameter of the piston 30 relative to thatot' the valve 12 as to make the downward pressure upon the valve 12almost counterbalance the upward pressure upon said valve caused by thesteam-pressure under the valve 12, taking into consideration, of course,the multiplied power which lever 15 supplies.

I have also provided a spring between lever 15 and arm 18, arranged tonormally hold lever 15 downwardly until a steam-pressure is applied tovalve 12 sufficiently strong to counterbalance the resiliency of suchspring.

This spring is applied as follows: The numeral 33 indicates a barattached to the outer end of lever 15 by means of the bolt 34 and havinga sliding plate 35 in its upper end and a similar plate 36 at its lowerend, held in place by nut 37. An extensile coil-spring'38 is mountedupon said bar between the plates 35 and 36. Attached to the outer end ofarm 18 is a bar 38, held in place by means of bolt 39 and having a plate40 at its top secured by nut 41.

The numeral 42 is used to indicate two rods having their ends secured inthe plates 35 and 40 by means of the nuts 43 and passed through openings44 in the plate 36. Obvio'usly an upward movement of lever 15 willcompress spring 38, and the resiliency of said spring is normallyexerted in holding'the lever 15 toits downward limit. Obviously thetension of the spring may be quickly and easily adjusted by manipulationof the nut 37. As previously explained, the major portion of the upwardpressure upon valve l2 is counterbalanced by the downward pull upon thelever l5, imparted by yoke 19 from the piston 30, and the remainder ofthe upward pressure upon the lever 12 is counterbalanced by the spring38, and this spring may readily be set 'to permit the elevation of valve12 when any certain predetermined amount of steam-pressure is appliedthereto. I have also provided means whereby the valve 12 may betemporarily held firmly to its seat against any amount ofsteam-pressure, so that the various parts of the valve-controllingmechanism may be repaired or replaced Without shutting off the steamfrom the boiler as follows: The numeral 45 indicates a rodscrew-threaded at 46 and having a hook 47 at its other end designedtooverlap lever 15 and enter notch 48 in said lever. 49 indicates asimilar rod screw-threaded at 5011i a direction opposite from thescrew-thread at 46 and having hook 51 at its other end to enter thenotch 52 of arm 18, and a turnbuckle 53 connects these screw-threadedends, the parts being so arranged that when the buckle is turned in onedirection the rods will move together and when turned in oppositedirection the rods will separate. Assuming, then, that it is desired totemporarily hold lever 15 downwardly', I place the hooks 47 and 51 overthe lever l5 and arm 18 and turn the buckle 53 until it is in positionto hold the lever to its downward limit, after which the end of thelever-operating devices may be detached for the purpose of repairing orreplacement, and the valve 12 will be securely held in position.

In practical use and assuming the parts to be assembled, as 'shown inFig. 1, I preferably proportion the parts so that the steampressure uponpiston 30 will operate upon lever 15 in such a manner as tocountcrbalance the major portion of the upward pressure of the steamupon valve 12, and the spring 38 is preferably placed at such tensionthat when the upward pressure upon valve 12 reaches a predetermineddanger-point the said spring will be compressed and the valve elevated.Obviously this predetermined danger-point may be changed and the springset in conformance thereto by manipulation of the nut 37.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States therefor, is*

1. The combination with a pop safetyvalve, of a steam-pressure devicefor holding the pop safety-valve to its seat the valve andsteam-pressure device being` acted on from the same source ofsteam-supply, and a yielding pressure device coacting with thesteampressure device for holding the pop safetyvalve to its seat.

2. The combination with a pop safetyvalve, of a steam-cylinder, a pistonin the cylinder, means for connecting the piston with the safety-valve,said means operating to hold the valve to its seat and means for ICO IIO

conducting steam'to the said cylinder, and a spring tending to hold'thevalve to its seat.

3. The combination with a pop safetyvalve of a piston, operated by steamfrom the same source as the steam pressing against the valve, thepressure uponV the piston tending to hold the valve to its seat, and aspring tending to hold the valve to its seat.

4. The combination with a pop safetyvalve, of a lever raised and loweredby the vertical movements of the valve, a steamcylinder communicatingwith the valve beneath the valve-seat anda piston in the cylinderconnected with said lever, and a spring tending to hold the valve to itsseat.

5. The combination with a pop safetyvalve, of `a lever raised andlowered by the vertical movements of the valve-stem, ayoke connectedwith said lever, a piston carried bythe yoke, a cylinder connected withthe valve-casing, having said" piston therein and a steam-supply pipecommunicating between the valve-casing beneath the valve and the saidcylinder.

6. The combination with a pop safetyvalve, havingavalve-seat, avertically-movable valve on the seat, a valve-stem connected with thevalve, a lever lfulcrumed above the valve-casing, connectedwith avalvestem, a yoke attached to the lever, a piston carried by the yoke,an arm on the valvecasing, a cylinder carried by said arm and havingsaid piston therein, and a steam-pipe communicating with thevalve-casing beneath the valve and leading to the upper end of the saidcylinder.

7. The combination with a pop Asafety- 'Lvalvehaving a valve-seat, avertically-movcasing, a cylinder carried by said` arm and having saidpiston therein, and a steam-pipe communicating with the valve -casingbeneath the valve and leading to theupper end of the said cylinder, abar attached to said lever and an extensile coil-spring` encircling thebar, a bar attached to said arm, rods attached to said bar, a plate atthe top of said rods in engagement with the top of the spring and theplate at the bottom of the first-mentioned bar in engagement with thelower end of the said spring.

8. The combination with a. pop safetyvalve, having a vertically-movablevalve, of a lever fulcrumed to the top ofthe valvecasing and connectedwith the valve-steml, a bar attached to the said lever extendingdownwardly, a plate at the lower end of said bar, a nut on the barbeneath the, plate, an

arm formed on the valve-casing, a bar attached to said arm, a platesupported by said bar, a plate slidingly mounted on the firstmentionedbar, an extensile spring mounted on the rst mentioned bar between saidplates and guide-rods fixed to the upper and lower plates and passedthrough the plate at the lower end of the upper bar, for the purposesstated.

9. -The combination with a pop safetyvalve of a lever raised and loweredby the vertical movements of the valve-stem, a yoke connected with saidlever, a piston carried by the yoke, a cylinderconnected withvalvecasing, having said Vpiston thereinv andV a steam -supply pipecommunicating between the valve-casing beneath the valve and the saidcylinder, and means detachably connected with said lever for positivelyholding the valve lto its seat. l

JOHN COLLIS.` Witnesses:

REUBEN G. ORWIG, J. RALPH ORWIG.

